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37dff84dbb
Reference code drop-in to firmware should make our implementations of Memset() and SafeMemcmp() get used now. BUG=chrome-os-partner:820 TEST=make && make runtests Change-Id: If0c06dfad85b67398a118985cdb751d20b2b65a4 Review URL: http://codereview.chromium.org/3173035
32 lines
795 B
C
32 lines
795 B
C
/* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Utility functions that need to be built as part of the firmware.
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*/
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#include "utility.h"
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void* Memset(void* d, const uint8_t c, uint64_t n) {
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uint8_t* dest = d; /* the only way to keep both cl and gcc happy */
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while (n--) {
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*dest++ = c;
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}
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return dest;
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}
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int SafeMemcmp(const void* s1, const void* s2, size_t n) {
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int result = 0;
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if (0 == n)
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return 1;
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const unsigned char* us1 = s1;
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const unsigned char* us2 = s2;
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/* Code snippet without data-dependent branch due to
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* Nate Lawson (nate@root.org) of Root Labs. */
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while (n--)
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result |= *us1++ ^ *us2++;
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return result != 0;
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}
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